Can someone help me distinguish the fake photocard? I'm having a very hard time..

They have..
– Same Texture
– Same Size
– Holo colors are the same/reflects
– Different backside color

The photocards were bought online but different shops. I asked them if its official and they sent me proof of their purchase. They also said it might be a manufacturing error or idk.. Can someone help me? I'd be very thankful 😄

by Lady_Airashiyo